Work

Theory of nonlinear magnetoelectric transport effects in normal metal–magnetic insulator heterostructures

Year: 2025

Type: article

Abstract: Heterostructures of normal metals (N) and magnetic insulators (F) show paradigmatic effects, such as spin-Hall magnetoresistance and electric drag currents. These effects are linear in the applied electric field E ( ω ) . Normal metal–magnetic insulator heterostructures also exhibit a characteristic nonlinear response quadratic in E ( ω ) , referred to as unidirectional spin-Hall magnetoresistance or spin-torque diode effect. In this article, we develop a theory of the bilinear response of FN bilayers and NFN trilayers for finite frequencies ω of the driving field and for four contributions that have been previously considered in the literature: Joule heating, phononmediated unidirectional magnetoresistance, the spin-torque diode effect, and magnonic unidirectional spin-Hall magnetoresistance. We identify their distinct dependencies on frequency and the magnetization direction of the magnetic insulator and examine their scaling with magnetic field and system geometry, providing a framework for experimental differentiation.

Source: Physical review. B./Physical review. B

DOI: 10.1103/h2dw-w3xg

Authors: Oliver Franke, Piet W. Brouwer

Institution: Freie Universität Berlin

Language: English

Topic: Magnetic properties of thin films

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Funder: Deutsche Forschungsgemeinschaft

Awards: TRR 227: Ultraschnelle Spindynamik, G4846862643, G579534092